On　the　basis　of　introducing　the　theory　of　Savitzky-golay　digital　smooth　filter,　and　analyzing　the　disadvantage　of　real-time　data　that　is　acquired　by　periodic　sampling　from　the　action　vacuum　circuit　breaker　(VCB)　with　slippery　line　rheostat,　a　new　method　is　proposed　using　Savitzky-golay　smooth　filter　to　filter　the　jam　signals　in　this　paper.　The　results　are　presented.